Pneumatic vibrator



Nov. 26, 1963 A. K. ANDERSON 3,112,093

PNEUMATIC VIBRATQR 2 Sheets-Sheet 1 Filed NOV. 5, 1961 INVENTOR. ALBEZT K. ANoerzson ATTORNEYS Nov; 26, 1963 A, K. ANDERSON 3,112,098

PNEUMATIC VIBRATOR Filed Nov. 5, 1961 2 Sheets-Sheet 2 IN VEN TOR.

ALBERT KANDEQsQN ATTORNEVS United States Patent C 3,112,098 PNEUMATIC VIBRATGR a Albert K. Anderson, Park Ridge, N..I., assignor to Vibc'o, Inc, Sparta, N.J., a corporation of New Jersey Filed Nov. 3, 1961, Ser. No. 149,9tl 3 Claims. (Cl. 259-1) This invention relates to mechanical vibrators, and more particularly to a mechanical vibrator of the pneumatically driven type.

A main object of the invention is to provide a novel and improved vibrator adapted to be operated by fluid under pressure, such as compressed air, or the like, the vibrator being simple in construction, requiring no special valves, and involving a minimum number of moving parts.

A further object of the invention is to provide an improved pneumatically driven vibrator which is inexpensive to fabricate, which is durable in construction, and which is very eflicient in operation, the vibrator involving parts which are of simple shape which can be manufactured by known apparatus without requiring the construction of special tools or dies.

Further objects and advantages of the invention will become apparent from the following description and claims, and from the accompanying drawings, wherein:

FIGURE 1 is a perspective view of an improved pneumatically operated vibrator constructed in accordance with the present invention.

FIGURE 2 is a perspective view of the components of the vibrator illustrated in FIGURE 1, shown in sep arated positions.

FIGURE 3 is a longitudinal vertical cross sectional view taken substantially on the line 33 of FIGURE 1, a portion of the cylindrical rotor member being broken away.

FIGURE 4 is a transverse vertical cross sectional view taken on the line 44 of FIGURE 3.

FIGURE 5 is astransverse vertical cross sectional view, similar to FIGURE 4, but showing the rotor moved to a position wherein the piston bar has been forced inwardly toward sealing position.

Referring to the drawings, 11 generally designates an improved fluid pressure operated vibrator constructed in accordance with the present invention. The vibrator 11 comprises a generally cylindrical chamber having the circular end walls 12 and 13 and the cylindrical main wall 14, the end walls being secured to the edges of the main wall 14 by suitable fastening screws 15. Centrally connected to the circular end wall 12 is a fluid inlet conduit 16, the conduit 16 being integrally formed with the central portion of the end wall 12, as shown in FIGURE 3, and being provided with an externally threaded connection portion 17 which may be engaged by a union coupling 18 to connect the conduit member 16 to a compressed air supply pipe 19.

Disposed in the chamber and slidably and sealingly positioned between the end walls 12 and 13 is a cylindrical solid vibratory rotor 20 which is smaller in diameter than the inside diameter of the cylindrical chamber wall 14 and which is formed with a. radial slot 21 which extends for its entire length and which extends from the central axial portion of the body 20, so that it is registrable with the bore 22 of the inlet conduit 16. Slidably mounted in the radial slot 21 is a piston bar 23 whose outer edge is slid-ably engageable with the inside surface of the cylindrical main wall member 14. The rotor 20 is formed with a fluid passage 24 which extends from the inner portion of the slot 21 to the periphery of the rotor body 20 and which is located on one side of the slot 21, as shown in FIGURE 4. As will be readily apparent from FIGURE 5, when the body 20- is rotated in a counterclockwise direction firom the position shown 2 in FIGURE 4, the piston bar 23 will be forced inwardly towards a position wherein it seals off the inner end of the bore 24.

The end walls 12 and 13 are formed with circular grooves 26 at their inner sides, said grooves being concentric with the axis of the main cylindrical wall 14, and communicating with exhaust passages 27 formed in the end walls 12 and 13 and spaced around the circular grooves 26, as shown in FIGURE 2.

The vibratory rotor body 20 is formed with a longitudinally extending passage '29 which extends for the full length of the body 20 and which is registrable with the grooves 26 to establish communication with the exhaust passages 27. The body 20 is formed with a plurality of outwardly extending passages 30 which connect the longi tudinally extending passage 29 with the periphery of the body 20, as is clearly shown in FIGURE 4.

As shown in FIGURE 3, a plurality of passages 24 are preferably provided, said passages 24 being spaced uniformly along the rotor body 20.

In operation, fluid under pressure, such as compressed air, is admitted centrally into the chamber through the inlet conduit 16, the fluid passing into the inner portion of the radial slot 21 and acting on the piston bar 23 to urge same outwardly, for example, to the position shown in FIGURE 4. The compressed fluid passes outwardly through the passages 24 into the space 31 at one side of the piston bar 23, exerting a force on the face of the piston bar 23 exposed thereto which tends to rotate the body 20 in a counterclockwise direction, as viewed in FIGURE 4, the air in the space 32 at the left side of the piston bar 23 being vented to atmosphere through the passages 30 and 29, the grooves 26 and the passages 27. The body 20 is thus rotated counterclockwise to the position shown in FIGURE 5, wherein the piston bar 23 is forced inwardly, sealing lOiT the inside ends of the passages 24, the body 20 eventually rotating sufliciently to expose the space 31 to the passages 30, allowing space 31 to exhaust to atmosphere. As this occurs, the fluid pressure acting in the inner portion of the radial slot 21 returns the rotor body 20 to a position wherein the passages 24 again communicate with the slot 21 and the passages 30 are no longer in communication with the space 3 1. Thus, the device returns to the position thereof illustrated in FIGURE 4, allowing the cycle to be repeated. The resultant action causes the rotor 20 to periodically strike the inside surface of the cylindrical wall 14 and also turn a flew degrees. The motion of the rotor body 20 is thus a combination of impacts and turns, producing a vibratory effect. The device may develop several thousand impacts per minute and a much smaller amount of revolutions per minute of the rotor body 20. The rate of rotation of body 20 is sufliciently small that its angular momentum does not substantially affect its vibratory movement.

As [above mentioned, the opposite ends of the rotor body 20 are in sliding and sealing contact with the inside surfaces of the end walls 12 and 13-, except that the grooves 26 are in communication with the longitudinally extending bore 29 in the roller body 20.

As will be further apparent from FIGURE 5, when the body 20 is in the position thereof causing the piston bar 23 to be pushed inwardly, the inner portion of the radial slot 21 remains in communication with the air supply conduit 16.

While a specific embodiment of an improved fluidoperated vibrator has been disclosed in the foregoing description, it will be understood that various modifications within the scope of the invention may occur to those skilled in the art. Therefore, it is intended that no limitations be placed on the invention except as defined by the scope of the appended claims.

What is claimed is:

1. A fluid-operated vibrator comprising a chamber having parallel end walls and a uniform internal cross sectional shape, a fluid inlet conduit at the central portion of one of said end walls, at least one of said end walls being formed with an outlet port spaced from its central portion, a cylindrical vibratory body disposed in said chamber with its ends in sliding and sealing contact With said end walls, said body being formed with a radial slot extending its entire length and communicating with said inlet conduit, and a piston bar slidably disposed in said slot, the body being formed on one side of the slot with a fluid passage connecting the inner portion of the slot with the periphery of the body, said piston bar being engageable with the bore of the chamber and being movable inwardly to thereby seal off said passage responsive to rolling movement of the body in the chamber, said body being formed with an exhaust passage connecting its periphery with an end thereof and being registrable with said outlet port to at times allow the chamber to be exhausted through said outlet port.

2. A fluid-operated vibrator comprising a chamber having parallel end walls and a circular cross sectional shape, a fluid inlet conduit at the central portion of one of said end walls, at least one of said end walls being formed with an outlet port spaced from its central portion, a cylindrical vibratory body disposed in said chamber with its ends in sliding and sealing contact with said end walls, said body being formed with a radial slot extending its entire length and communicating with said inlet conduit, and a piston bar slidably disposed in said slot, the body being formed on one side of the slot with a fluid passage connecting the inner portion of the slot with the periphcry of the body, said piston bar being engageable with the bore of the chamber and being movable inwardly thereby to seal oif said passage responsive to rolling movement of the body in the chamber, said body being formed with a longitudinally extending exhaust passage and with passages connecting its periphery to said longitudinally extending passage, said longitudinally extending passage being registrable with said outlet port to at times allow the chamber to be exhausted through said outlet port.

3. A fluid-operated vibrator comprising a chamber having parallel end walls and a circular cross sectional shape, a fluid inlet conduit at the central portion of one of said end walls, said end walls being formed with internal circular grooves and with outlet ports communicating with said grooves, a cylindrical vibratory body disposed in said chamber with its ends in sliding and sealing contact with said end walls, said body being formed with a radial slot extending its entire length and communicating with said inlet conduit, and a piston bar slidably disposed in said slot, the body being formed on one side of the slot with a fluid passage connecting the inner portion of the slot with the periphery of the body, said piston bar being engageable with the bore of the chamber and being movable inwardly to thereby \seal oif said passage responsive to rolling movement of the body in the chamber, said :body being formed with a longitudinally extending exhaust passage and with passages connecting its periphery to said longitudinally extending passage, said longitudinally extending passage being registrable with said circular grooves to at times allow the chamber to be exhausted through said ports.

References Cited in the file of this patent UNITED STATES PATENTS 

1. A FLUID-OPERATED VIBRATOR COMPRISING A CHAMBER HAVING PARALLEL END WALLS AND A UNIFORM INTERNAL CROSS SECTIONAL SHAPE, A FLUID INLET CONDUIT AT THE CENTRAL PORTION OF ONE OF SAID END WALLS, AT LEAST ONE OF SAID END WALLS BEING FORMED WITH AN OUTLET PORT SPACED FROM ITS CENTRAL PORTION, A CYLINDRICAL VIBRATORY BODY DISPOSED IN SAID CHAMBER WITH ITS ENDS IN SLIDING AND SEALING CONTACT WITH SAID END WALLS, SAID BODY BEING FORMED WITH A RADIAL SLOT EXTENDING ITS ENTIRE LENGTH AND COMMUNICATING WITH SAID INLET CONDUIT, AND A PISTON BAR SLIDABLY DISPOSED IN SAID SLOT, THE BODY BEING FORMED ON ONE SIDE OF THE SLOT WITH A FLUID PASSAGE CONNECTING THE INNER PORTION OF THE SLOT WITH THE PERIPHERY OF THE BODY, SAID PISTON BAR BEING ENGAGEABLE WITH THE BORE OF THE CHAMBER AND BEING MOVABLE INWARDLY TO THEREBY SEAL OFF SAID PASSAGE RESPONSIVE TO ROLLING MOVEMENT OF THE BODY IN THE CHAMBER, SAID BODY BEING FORMED WITH AN EXHAUST PASSAGE CONNECTING ITS PERIPHERY WITH AN END THEREOF AND BEING REGISTRABLE WITH SAID OUTLET PORT TO AT TIMES ALLOW THE CHAMBER TO BE EXHAUSTED THROUGH SAID OUTLET PORT. 